Mobile Device Light Guide Display

ABSTRACT

Light guide techniques are described. In one or more implementations, an apparatus includes a housing, a light guide supported by the housing, a light engine disposed within the housing and optically coupled to the light guide, and one or more modules disposed within the housing and implemented at least partially in hardware. The one or more modules are configured to cause the light engine to output a user interface for display using the light guide along an image plane focused at infinity.

BACKGROUND

Users are exposed to a wide range of display devices in their everydaylives. A user, for instance, may interact with mobile communicationdevices such as tablet computers and mobile phones when in a mobilesetting, such as when traveling to and from work. The user may alsointeract with computers having traditional form factors, such as alaptop or desktop PC, at the user's work, home and so forth. The usermay also watch a television, such as to play video games, watch moviesand television programming, and so on.

Traditional display techniques that were employed by these deviceshowever, could cause eye strain to users viewing the devices, especiallywhen viewing the devices for significant amounts of time. This eyestrain could therefore have an effect on a user's experience with thedevices, as well as a physical effect on the user, such as to cause theuser to wear glasses as a result of the strain.

SUMMARY

Light guide techniques are described. In one or more implementations, anapparatus includes a housing configured in a hand-held form factor, alight guide supported by the housing, a light engine disposed within thehousing and optically coupled to the light guide, and one or moremodules disposed within the housing and implemented at least partiallyin hardware. The one or more modules are configured to cause the lightengine to output a user interface for display using the light guidealong an image plane focused at infinity.

In one or more implementations, an apparatus includes a housingconfigured in a hand-held form factor, a light guide, supported by thehousing, having a first side configured to be viewed by a user and asecond side opposing the first side that includes one or more touchsensors, a light engine disposed within the housing and opticallycoupled to the light guide, and one or more modules disposed within thehousing and implemented at least partially in hardware. The one or moremodules are configured to cause the light engine to project a userinterface for display using the light guide that is viewable via thefirst side and detect one or more inputs using the one or more touchsensors located via the second side, the one or more inputs usable toinitiate one or more operations.

In one or more implementations, an apparatus includes a housing, a lightguide supported by the housing having a first side that is viewable by auser, a second side opposing the first side, and switchable in-couplingoptics. The apparatus also includes a light engine disposed within thehousing and optically coupled to the in-coupling optics of the lightguide and one or more modules disposed within the housing andimplemented at least partially in hardware. The one or more modules arecommunicatively coupled to the switchable in-coupling optics to cause aswitch between a first mode in which an output of the light engine isdisplayed through the first side of the light guide and a second mode inwhich an output of the light engine passes through the second side ofthe light guide.

In one or more implementations, an apparatus includes a housingconfigured in a hand-held form factor, one or more sensors configured todetect a position and orientation of the housing in three dimensions ina physical environment of the housing, a light guide that is at leastpartially transparent and supported by the housing, a light engine thatis optically coupled to the light guide, and one or more modulesdisposed within the housing and implemented at least partially inhardware. The one or more modules are configured to calculate a positionand orientation of an augmentation and cause the light engine to outputthe augmentation for display using the light guide such that theaugmentation is viewable concurrently with at least a portion of thephysical environment through the light guide.

In one or more implementations, one or more images of a user arecaptured using one or more cameras of a handheld device that is held bya user. A location of the user's pupils is calculated in threedimensional space from the captured one or more images by the handhelddevice. An augmentation is displayed on a transparent display of thehandheld device based on the calculated location of the user's pupilsthat is viewable concurrently with at least a portion of a physicalsurroundings of the handheld device that is viewable through thetransparent display.

In one or more implementations, an apparatus includes a housingconfigured in a hand-held form factor, one or more cameras positioned inthe housing to track one or more eyes of a user, a light guide that isat least partially transparent and supported by the housing, a lightengine that is optically coupled to the light guide, and one or moremodules disposed within the housing and implemented at least partiallyin hardware. The one or more modules are configured to calculate aposition of one or more pupils of the user in three-dimensional spaceand cause the light engine to output an augmentation for display basedon the calculated position using the light guide such that theaugmentation is viewable concurrently with at least a portion of thephysical environment through the light guide.

In one or more implementations, a display device of a computing deviceis viewed at a first distance such that a first field of view of a userinterface displayed by the display device is viewable. The displaydevice of the computing device is viewed at a second distance that isless than the first distance such that a second field of view of theuser interface displayed by the display device is viewable that isgreater than the first field of view.

In one or more implementations, an apparatus includes one or moremodules implemented at least partially in hardware to configure a userinterface and a display device communicatively coupled to the one ormore modules to output the user interface to be viewable by a userwithin a range of distances from the display device such that closerdistances within the range permit the user to have an increased field ofview in comparison with distances within the range that are further awayfrom the user.

In one or more implementations, an apparatus includes one or moremodules implemented at least partially in hardware to configure a userinterface and a display device communicatively coupled to the one ormore modules to output the user interface to be viewable by a user suchthat different portions of the user interface are viewable by the userdepending on an angle of tilt of the display device in relation to oneor more eyes of the user.

In one or more implementations, a display device includes a housingconfigured to be supported by a surface, a light guide supported by thehousing, a light engine disposed within the housing and opticallycoupled to the light guide, and one or more modules disposed within thehousing and implemented at least partially in hardware. The one or moremodules are configured to cause the light engine to output a userinterface for display using the light guide along an image plane focusedat infinity.

This Summary is provided to introduce a selection of concepts in asimplified form that are further described below in the DetailedDescription. This Summary is not intended to identify key features oressential features of the claimed subject matter, nor is it intended tobe used as an aid in determining the scope of the claimed subjectmatter.

BRIEF DESCRIPTION OF THE DRAWINGS

The detailed description is described with reference to the accompanyingfigures. In the figures, the left-most digit(s) of a reference numberidentifies the figure in which the reference number first appears. Theuse of the same reference numbers in different instances in thedescription and the figures may indicate similar or identical items.

FIG. 1 is an illustration of an environment in an example implementationthat is operable to employ light guide techniques as described herein.

FIG. 2 depicts an example of a display device of FIG. 1 as including alight guide illustrated in a front view.

FIG. 3 depicts an example of the light guide of FIG. 2 which is shown ingreater detail using a side view.

FIG. 4 depicts an example implementation of the light guide and lightengine of the display device of FIG. 3 in which layers of the lightguide are shown.

FIG. 5 depicts an example implementation showing the computing device ofFIG. 1 as outputting a user interface and supporting gestures detectedvia a back side of the display device.

FIG. 6 depicts an example implementation of the display device of thecomputing device of FIG. 1 that shows differences in field of view basedon corresponding differences in distance between the display device anda user.

FIGS. 7 and 8 illustrate example side views of first and second stagesshown in FIG. 6, respectively.

FIG. 9 depicts an example implementation showing a display device ofFIG. 1 as being configured to rest on a surface horizontally.

FIG. 10 is a flow diagram depicting a procedure in an exampleimplementation in which captured images are used to locate a user'spupils for display of an augmentation.

FIG. 11 is a flow diagram depicting a procedure in an exampleimplementation in which a display device is viewed at differentdistances such that a field of view is expanded the closer the distancebetween the user and the device.

FIG. 12 illustrates an example system including various components of anexample device that can be implemented as any type of computing deviceas described with reference to FIGS. 1-11 to implement embodiments ofthe techniques described herein.

DETAILED DESCRIPTION Overview

Traditional techniques employed by display devices involved a displaythat is focused at an image plane that coincides with a surface of thedevice. Therefore, these traditional techniques could cause eyestrain tousers that viewed the devices, which could physically affect the user aswell as affect the user's experience with the devices.

Light guide techniques are described herein. In one or moreimplementations, a light guide is configured for use as a displaydevice. The light guide, for instance, may be incorporated as part of adevice having a handheld form factor, such as a tablet computer, mobilephone, portable gaming device, and so forth. The light guide may also beincorporated as part of a variety of other devices, such as atelevision, as part of a monitor for a desktop or laptop computer, andso forth.

The light guide may be configured to provide a display along an imageplane focused at infinity. Thus, the light guide may be viewed by a userwith minimal or no contraction of eye muscles, such as may be observedby a user when viewing the horizon or other far away object. In thisway, users that traditionally utilized glasses to view a display device(e.g., suffered from presbyopia) may in some instances view the lightguide without the glasses.

A variety of functionality may be enabled by leveraging use of the lightguide. For example, the light guide may be configured to supporttransparency such that physical surroundings of the light guide areviewable through the light guide. This may be utilized to support avariety of different scenarios, such as augmented reality in which anaugmentation is displayed and the physical environment is viewablethrough the display. In another example, the light guide may support afield of view that increases as a distance between a user's eyes and thelight guide decreases. In this way, a user may bring a device (e.g., amobile phone) that employs the light guide closer to see more of a userinterface output by the device. In addition, since the image plane mayappear ‘behind’ the screen of the actual device, the device may supportgestures involving movement of the device itself, such as to pan imagesby simply tilting the device. Thus, the functionality supported by theincreased field of view and the panning of the image may be particularlyuseful for a mobile device where the size of the display device islimited and content exceeds the available screen real estate. A varietyof other examples are also contemplated, such as to employ touchsensors, use of eye tracking hardware, use of a controllable rear layerof the device that is capable of varying the opacity from clear todark/opaque (e.g., to improve contrast), and so on, further discussionof which may be found in relation to the following figures.

In the following discussion, an example environment is first describedthat may employ the light guide techniques described herein. Exampleprocedures are then described which may be performed in the exampleenvironment as well as other environments. Consequently, performance ofthe example procedures is not limited to the example environment and theexample environment is not limited to performance of the exampleprocedures.

Example Environment

FIG. 1 is an illustration of an environment 100 in an exampleimplementation that is operable to employ light guide techniques asdescribed herein. The illustrated environment 100 includes a computingdevice 102, which may be configured in a variety of ways. For example,the computing device 102 is illustrated as employing a housing 104 thatis configured in a handheld form factor to be held by one or more hands106, 108 of a user as illustrated. The handheld form factor, forinstance, may include a tablet computer, a mobile phone, portable gamedevice, and so forth. However, a wide variety of other form factors arealso contemplated, such as computer and television form factors asdescribed in relation to FIG. 12.

Accordingly, the computing device 102 may range from full resourcedevices with substantial memory and processor resources (e.g., personalcomputers, game consoles) to low-resource devices with limited memoryand/or processing resources (e.g., traditional televisions, net books).Additionally, although a single computing device 102 is shown, thecomputing device 102 may be representative of a plurality of differentdevices, such as a user-wearable helmet or glasses and game console, aremote control having a display and set-top box combination, and so on.

The computing device 102 is further illustrated as including a displaydevice 110 that is at least partially transparent in this example. Thetransparency of the display device 110 is illustrated as allowing atleast a portion of the physical surroundings 112 of the computing device102 to be viewed through the device. In the illustrated example, thephysical surroundings 112 that are viewable through the display device110 include trees and part of a finger of the user's hand 106 that isbeing used to hold the computing device 102. A car 114 is alsoillustrated as being displayed by the display device 110 such that atleast a portion of the user interface and the physical surroundings 112are viewable using the display device 110. This may be used to support avariety of different functionality, such as augmented reality as furtherdescribed below.

The computing device 102 also includes an input/output module 116 inthis example. The input/output module 116 is representative offunctionality relating to detection and processing of inputs and outputsof the computing device 102. For example, the input/output module 116may be configured to receive inputs from a keyboard, mouse, to recognizegestures and cause operations to be performed that correspond to thegestures, and so on. The inputs may be identified by the input/outputmodule 116 in a variety of different ways.

For example, the input/output module 116 may be configured to recognizean input received via touchscreen functionality of a display device 110,such as a finger of a user's hand 108 as proximal to the display device110 of the computing device 102, from a stylus, and so on. The input maytake a variety of different forms, such as to recognize movement of thefinger of the user's hand 108 across the display device 110, such as atap on the car 114 in the user interface as illustrated by a finger ofthe user's hand 108, drawing of a line, and so on. The user's handand/or finger can either be touching the device or hovering above thedevice and these could be detected as separate gestures. Other examplesof input include tracking pupils and blinks of the user's eyes, gesturesinvolving movement of the device itself (e.g., tilting or shaking thedevice), and so on.

In implementations, these inputs may be recognized as gestures that areconfigured to initiate one or more operations of the computing device102 or other device, such as to navigate through a user interface,select and/or move objects displayed in the user interface, and so on.Although the gesture is illustrated as being input through a front ofthe display device 110, the computing device 102 may also include touchsensors located on the back of the display device 110 to recognizegestures, further discussion of which may be found beginning in relationto FIGS. 4 and 5.

The input/output module 116 is also illustrated as including anaugmented reality module 118. The augmented reality module 118 isrepresentative of functionality of the computing device 102 to augment aview of the physical surroundings 112 (e.g., the “real world”) of thecomputing device 102 using the display device 110. In the illustratedexample, for instance, the computing device 102 is illustrated as beingphysically positioned in surroundings that include three trees andfingers of the user's hand 106.

The augmented reality module 118 is configured to output an augmentation(e.g., the car 114) to be viewed in conjunction with the physicalsurroundings 112. To generate this view and know “where” to place toaugmentation, the augmented reality module 118 may leverage a variety oftechniques to determine an orientation and/or position of the computingdevice 102 in relation to the physical surroundings 112 of the device.For example, the augmented reality module 118 may leverage a camera 120to capture images of the physical surroundings 112. The augmentedreality module 118 may then process the images to locate one or moremarkers to determine how the computing device 102 is positioned,oriented, moved, and so on.

These markers may take a variety of forms. For instance, the augmentedreality module 118 may set one or more view points in the physicalsurroundings 112 as markers and thus serve as a basis to determineorientation and/or positioning, such as where the trunks of the treesmeet the ground. In another instance, the augmented reality module 118may leverage a view of one or more augmented reality (AR) tags that arephysically positioned within the surrounding environment of thecomputing device 102. Thus, the items in the physical surroundings 112may act as a basis to determine where the computing device 102 islocated as well as how the computing device 102 is oriented.

In another example, the camera 120 may be configured to capture one ormore images of a user of the computing device 102. For example, a lensof the camera 120 is illustrated in FIG. 1 as a circle disposed to theright of the display device 110 in the housing 104 as pointed toward aface of a user of the computing device 102. Images captured by thecamera 120 may then be used to determine a three dimensional location ofpupils of the user. In one or more implementations, the location of thepupils is calculated without calculating a vector that describes “wherethe eye is pointing,” thereby conserving resources of the computingdevice 102. Other examples are also contemplated in which such a vectoris calculated. In this way, the augmented reality module 118 maydetermine how to output the augmentation (e.g., the car 114) for displayby the display device 110.

The augmented reality module 118 may also leverage one or more sensors122 to determine a position and/or orientation of the computing device102, and more particularly a position and/or orientation of the displaydevice 110. For example, the sensors 122 may be configured as aninertial measurement unit (IMU), which may include a gyroscope, one ormore accelerometers, a magnetometer, and so on including any combinationthereof. These units may be used to generate a basis with which todetermine an orientation and position of the computing device 102 inrelation to its physical surroundings 112.

Through one or more of these examples, the augmented reality module 118may capture a view of the “reality” that is to be augmented. Theaugmentation may then be computed to be displayed at a size,orientation, and location using the display device 110. The augmentationmay be configured in a variety of ways, such as for two-dimensionaloutput, three dimensional output, and so on. For instance, the augmentedreality module 118 and the display device 110 may leverage stereoscopictechniques to give a perception of depth to the augmentation, such asthrough auto-stereoscopy in which optics are used by the display device110 to split an image directionally to the user's eyes. A variety ofother techniques are also contemplated without departing from the spiritand scope thereof. Further, it should be readily apparent thataugmentations generated by the augmented reality module 118 may assume avariety of other forms, such as objects as part of a game and otherchanges to a view of the physical surroundings 112 of a computing device102 through display as part of a user interface that is viewable throughthe display device 110.

The display device 110 may be configured in a variety of ways to supportthe techniques described herein, such as through configuration as alight guide that provide an output utilizes a focal plane focused atinfinity. An example of such a light guide is described beginning inrelation to the following figure.

FIG. 2 depicts an example 200 of the display device 110 of FIG. 1configured as including a light guide illustrated in a front view. Theexample 200 includes a light guide 202 and a light engine 204 that formthe display device 110. The light guide 202 may be configured in avariety of ways, such as a piece of glass, plastic, or other opticallytransmittable material that serves to display an output of the lightengine 204.

The light engine 204 may be configured in a variety of ways, such as apico projector or other image output device. Examples of a light engine204 include laser driven LCOS or LED driven scanning, an LCOS display,e.g., including RGB LEDs, and so on. The light engine 204 is opticallycoupled to the light guide 202 such that an output of the light engine204 is displayed by the light guide 202 for viewing by one or moreusers. The light engine 204 may be optically coupled to the light guide202 in a variety of ways, an example of which may be found in relationto the following figure.

FIG. 3 depicts an example 300 of the light guide 202 of FIG. 2 which isshown in greater detail using a side view. The light guide 202 in thisexample is illustrated as including in-coupling optics 302 andout-coupling optics 304. The in-coupling optics 302 are configured tooptically couple the light engine 204 to the light guide 202. Thein-coupling optics 302 may be configured in a variety of ways, such assurface relief gratings, switchable Bragg gratings, volume holographgratings, reflective and partially reflective surfaces, free formoptical elements, wedge optics, and so forth.

In the illustrated example, the in-coupling optics 302 are configured tobend light output by the light engine 204 approximately ninety degreesfor transmission to the out-coupling optics 304. Thus, the in-couplingoptics 302 in this example may utilize one or more techniques to “turnlight” for transmission to the out-coupling optics as described above.

Further, the in-coupling and out-coupling optics 302, 304 may beutilized as pupil expanders to expand an output from the light engine204. The in-coupling optics 302, for instance, may be configured toexpand an output of the light engine 204 horizontally. The out-couplingoptics 304 may then receive this horizontally expanded output andfurther expand it in a vertical direction for output to the eye 306,e.g., an eye of the user of the computing device 102, such as by againutilizing one or more techniques to “turn light”.

Therefore, the light engine 204 may be configured as a laser driven LCOSor LED driven scanning or LCOS display, may include RGB LEDs or lasershaving a bandwidth less than the range of five to ten nanometers toallow for efficient diffraction (if one of the diffractive techniques isused to couple light in and/out; in other cases the bandwidth of theLEDs is not so constrained), and so forth. The light engine 204 isoptically coupled to the in-coupling optics 302 of the light guide 202utilizing one or more techniques to “turn light” as previouslydescribed. Light is then transmitted along the light guide 202 throughthe in-coupling optics 302 using total internal reflection (TIR) to ahorizontal expansion grating. This grating serves to expand the “exitpupil” horizontally and in addition turns the light ninety degrees so itis propagating upwards in the example 300 as shown by the arrows. Thelight then encounters the out-coupling optics 304 which expands the“exit pupil” vertically and again turns the light as shown by the arrowsso it is coupled out of the light guide 202 and towards an eye 306 ofthe user to view an image, e.g., a part of a user interface.

In one or more implementations, the in-coupling optics 302 may beswitchable to support different display modes. For example, thein-coupling optics 302 may be “switched on” in a first mode (e.g., usinga switchable Bragg grating) to cause the output of the light engine tobe “turned” and transmitted to the out-coupling optics 304 for displayto the eye 306 of the user as described above.

The in-coupling optics 304 may also be “switched off” to support asecond mode in which the display device 110 is to act as a projector,such as to project an output of the light engine 204 “out the back” ofthe housing 104 of the computing device 102 of FIG. 1. In this example,the in-coupling optics 304 are switched off such that the light from thelight engine 204 is not bent to couple to the out-coupling optics 304.

Rather, the light from the light engine 204 passes through thein-coupling optics 302 without bending in this example to serve as aprojector. The computing device 102, for instance, may include a lensand light valve 308 supported by the housing 104 of FIG. 1 to use theoutput of the light engine 204 as a projector, e.g., to project theoutput onto a surface that is external to the computing device 102 suchas a tabletop, wall, and so forth. In this way, the display device 110may be used in a variety of modes to support different displaytechniques for use by the computing device 102.

FIG. 4 depicts an example implementation of the light guide 202 andlight engine 204 of the display device 110 in which layers of the lightguide 202 are shown. The light guide 202 includes an opticallytransparent material 402 and diffraction grading matrix 404 that areusable to implement out-coupling optics 304 as described above inrelation to FIG. 3.

The light guide 202 also includes a layer 406 to implement touch sensorsacross a front surface of the display device 110. The layer 406, forinstance, may be configured as a grid formed using indium tin oxide(ITO) to detect X, Y coordinates of a contact, such as one or morefingers of the user's hand 108 as shown in relation to FIG. 1. Thus,this layer 406 may be used to provide inputs to the input-output module116 which may be used to recognize one or more gestures to initiate oneor more operations of the computing device 102, e.g., navigate through auser interface, launch an application, interact with a display object,and so forth.

The light guide 202 may also include a layer 408 disposed on the back ofthe light guide 202 to implement touch sensors. The light guide 202, forinstance, may be configured to support viewing at a distance from theuser's eye such that it is inconvenient for a user to interact with afront surface of the light guide, e.g., the layer 406 that supports thetouch sensors on the front of the display device 110. Accordingly, thelayer 408 disposed on the rear of the device may also be configured torecognize gestures, further discussion of which may be found beginningin relation to FIG. 5.

The light guide 202 is also illustrated as including an electro-chromiclayer 410 that is separated from the diffraction grading matrix 404 byan air gap 412 or lower optical index material. The electro-chromiclayer 410 is operable to alternate between transparent andnon-transparent states. This may be used for a variety of purposes, suchas to control which part of a physical surroundings 112 of the computingdevice 102 are viewable through the display device 110, improve contrastfor portions of a user interface displayed by the display device 110,and so on, further discussion of which may be found in relation to thefollowing figure.

FIG. 5 depicts an example implementation 500 showing the computingdevice 102 of FIG. 1 as outputting a user interface and supportinggestures detected via a back side of the display device. In thisexample, the display device 110 outputs a user interface configured as astart screen for the computing device 102. The start screen includes aplurality of tiles that are selectable to launch respectiveapplications, and may also be configured to output notificationsregarding the applications. An example of notifications is illustratedusing the weather tile that includes a notification regardingtemperature and current weather conditions in Redmond.

As described in FIG. 4, the display device 110 may be configured todetect inputs (e.g., gestures) using the front of the device that isoriented towards a user as well as a rear of the device that is orientedaway from the user, e.g., is positioned on an opposing side from thefront of the device. A user, for instance, may make a gesture using oneor more fingers of the user's hand 106. A variety of different gesturesmay be made, such as to select a tile displayed by the display device,navigate through a user interface using a pan gesture, a zoom gesture,and so on. In this way, portions of the user's hand 106 that arepositioned at the back of the computing device 102 may still be used toprovide inputs.

Further, as also described in relation to FIG. 4, the display device 110may be configured to be optically transparent, yet also include a layer(e.g., the electro-chromic layer 410) to control which portions of thedisplay device 110 are made transparent. This may be used, for instance,to improve contrast of portions of the display device that are used todisplay the user interface. An example of this may include the portionsthat are used to display the tiles and text (e.g., “start”) in theillustrated example, which may be used to support the color black in theuser interface.

These techniques may also be configured to support selectable opacity,such as to control an amount of the physical surroundings that areviewable through the display device 110. This may be used to provide avariety of functionality. For example, portions of the display device110 may be made partially transparent to allow a portion of a user'shand 106 to be viewed through the display device. In this way, a usermay readily view “where” the user's finger is positioned, which may aideuser interaction including use of gestures that are detected viatouchscreen functionality disposed on the rear of the display device110.

Additionally, this technique may be combined with how the user interfaceitself is displayed as illustrated. In the example implementation 500,portions of the finger of the user's hand 106 that are disposed proximalto the back of the display device 110 are made transparent such that auser may view the finger of the user's hand. This includes portions ofthe user interface such that the finger of the user's hand 106 appearsto be displayed in conjunction with the tile, such that the user mayreadily determine which tile is currently selectable at the currentposition of the finger. Portions of the tile in the user interface thatdo not coincide with the contact are not made transparent (e.g., throughdisplay of the user interface and/or use of the electro-chromic layer410) in this example. In this way, interaction with the back of thedisplay device 110 may be aided. A variety of other examples are alsocontemplated, such as display in the user interface of indicia thatcorrespond to points that are contacted by the finger of the user's hand106 on the back of the display device 110. It is also noted that thisper-region opacity control may significantly enhance the appearance ofaugmentations that are displayed by the display device while allowingtransparency between the augmentations so the physical surroundings(e.g., the “real world”) can be viewed clearly concurrently with theaugmentations. Note also that the entire display can be made opaquewhich may be used to aid in experiences that do not involve a view ofthe real world, e.g., such as to watch a movie.

FIG. 6 depicts an example implementation 600 of the display device 110of the computing device 102 that shows differences in field of viewbased on corresponding differences in distance between the displaydevice 110 and a user. The example implementation 600 is illustratedusing first and second stages 602, 604. At the first stage 602, thecomputing device 102 is illustrated as being positioned at a firstdistance away from the user, such as when being held at arm's length,e.g., approximately thirty inches.

As previously described, the computing device 102 may include a displaydevice 110 that incorporates the light guide 202 of FIG. 2. The lightguide 202 may be configured to provide an output through theout-coupling optics 304 of FIG. 3 along an image plane focused atinfinity for viewing by a user. The out-coupling optics 304, forinstance, may provide an output of parallel light that a user may viewsimilar to looking at a faraway object, such as the horizon. Because ofthis, the display device 110 may be viewed from a wide range ofdistances, including distances that are even less than an inch from theuser's eye 306 up to a point at which the display device 110 itself isnot viewable.

Use of the light guide as part of the computing device 102 may alsosupport techniques relating to field of view. At the first stage, forinstance, a user interface is illustrated as being display by thedisplay device 110. The user interface in this example includes aheadline “Redmond News” along with two columns, which are illustrated as“Sports” and “Weather.” As previously described, the first stage 602shows the computing device 102, and therefore the display device 110 ofthe computing device 102, as positioned at approximately an arm's lengthfrom the eyes of the user holding the device.

The user in this example may then desire to view more of the userinterface, such as to view a larger amount content included in the userinterface. In this example, through configuration of the display device110 to include the light guide, the user may simply physically move thecomputing device 102 closer as shown in the second stage 604. By movingthe display device 110 closer, the field of view viewable by the userfrom the display device 110 increases.

This is illustrated in the second stage 604 through viewing through thedisplay device of the same user interface displayed in the first stage602. However, additional columns of the user interface are viewable aspositioned in the second stage 604, such as the “Business” and “Local”columns as well as additional content in the columns. Thus, the field ofview increases as the display device 110 is moved closer to the user'seye.

Further this increase is passive in that the size or resolution is notchanged by the computing device 102 itself, e.g., due to inputs receivedfrom a user to increase the size or resolution, use of one or moresensors, and so on. In this way, objects displayed by the display device110 remain in focus regardless of how close the user's eye is positionedto the display. This may therefore be used by a user to adjust an amountthat is viewed on the screen, such as to read a newspaper, browse theweb or consume short video content by changing a distance between theuser and the display. For example, using a 3.5″ screen as an example, ifthe display device 110 produces a 45 degree field of view, holding thedisplay device 110 one inch from the eye would yield an image equivalentto a 105″ diagonal display device at an arm's length of 30″. Furtherdiscussion of the field of view techniques may be found in relation tothe following figure.

FIGS. 7 and 8 illustrate example side views of the first and secondstages 602, 604 shown in FIG. 6, respectively. At the first stage 602,the user's field of view is illustrated using dashed lines to show aportion of a user interface 702 that is viewable through the displaydevice 110. At the second stage shown in FIG. 8, the user's eye ispositioned closer to the display device 110, which enables the user toview a larger portion of the user interface 702 as shown by the dashedlines. Thus, the display device 110 may support these different fieldsof view by outputting the user interface at an image plane that isfocused at infinity, e.g., through output of parallel light by the lightguide 202 of FIG. 2.

This functionality may be likened to viewing a billboard through a holein a fence. As the user moves closer to the hole in the fence, not onlyis the type size of the billboard increased (e.g., a user is able toview smaller text as shown in FIG. 6), but the amount of the billboardthat is viewable also increases. Thus, the display device 110 maypassively enable a user to alter a field of view viewable to the userbased on a range of distances between the user's eye and the displaydevice 110. For instance, the range may be defined based on n ability ofa user to view an entirety of the display device 110.

The field of view, for instance, may increase as a user nears thedisplay device 110 until a user is so close that outer portions of thedisplay device are no longer viewable in the periphery of the user'svision. Although altering the field of view based on distance wasdescribed in relation to a mobile device such that a user could move thedevice itself, these techniques may also be employed in situations inwhich the user moves and the device is configured to remain at aconstant position, an example of which may be found in relation to thefollowing figure.

Another scenario may be supported by these techniques to expand userinteraction. For example, a user may view the computing device 102 atarm's length, similar to viewing the billboard in the previous example.However, instead of bringing the device closer to the user's eyes, theuser may move the device (e.g., tilt the device at different anglesrelative to a plane that is perpendicular to axis between the displaydevice and a user's eye) to view different areas of the billboard thatwould not be visible in the original position. This would, for example,allow a user to sit comfortably and read different portions of anewspaper at arm's length by tilting the device. It is useful tocontrast the new device experience with currently available technology.When trying to read a newspaper on a handheld device such as one oftoday's cellphones, a user would be forced to continually scroll usingtouch or other gestures to navigate through the content. With thetechniques described herein, however, tilting the device to seedifferent portions of the user interface may be supported passively bythe display device like the field of view example above.

FIG. 9 depicts an example implementation 900 showing the display device110 of FIG. 1 as being configured to rest on a surface horizontally. Thedisplay device 110 in this example is illustrated as incorporated withina housing 902 that is configured to rest on a surface, such as adesktop, table top, and so forth for use in a computer configuration asfurther described in relation to FIG. 12. The display device 110incorporates a light guide 202 and light engine 204 of FIG. 2 and assuch, may display a user interface using the light guide along an imageplane focused at infinity.

In the illustrated example, the display device 110 is illustrated assupporting transparency and configured within the housing 902 such thatthe physical surroundings are viewable through the display device 110,such as a portion of a desktop computing device as illustrated. Otherimplementations are also contemplated, such as implementations in whichthe physical surroundings are not viewable through the display device110, are viewable in a controllable manner as described in relation toFIG. 4, and so on. Other implementations of the display device 110within the housing are also contemplated, such as a televisionimplementation in which the housing is configured to be mounted to avertical surface, an example of which is further described in relationto FIG. 12.

Example Procedures

The following discussion describes light guide techniques that may beimplemented utilizing the previously described systems and devices.Aspects of each of the procedures may be implemented in hardware,firmware, or software, or a combination thereof. The procedures areshown as a set of blocks that specify operations performed by one ormore devices and are not necessarily limited to the orders shown forperforming the operations by the respective blocks. In portions of thefollowing discussion, reference will be made to the environment andexample systems of FIGS. 1-9.

FIG. 10 depicts a procedure 1000 in an example implementation in whichcaptured images are used to locate a user's pupils for display of anaugmentation. One or more images of a user are captured using one ormore cameras of a handheld device that is held by a user (block 1002). Auser, for instance, may have images captured by a forward-facing cameraof a mobile communications device, e.g., a mobile phone, tabletcomputer, and so on.

A location of a user's pupils is calculated in three dimensional spacefrom the captured one or more images by the handheld device (block1004). The augmented reality module 118, for instance, may examine theimages to determine the location.

An augmentation is displayed on a transparent display of the handhelddevice based on the calculated location of the user's pupils that isviewable concurrently with at least a portion of a physical surroundingsof the handheld device that is viewable through the transparent display(block 1006). As shown in FIG. 1, for instance, the augmentation may beconfigured as a car 114 that is viewable concurrently with a portion ofthe physical surroundings 112 that are viewable through the displaydevice 110, which in this instance are trees and part of a finger of auser's hand 106. Other examples are also contemplated, e.g., the cameramay rest on a surface that is not held by a user, such as part of acomputer monitor, part of a stand-alone camera that is communicativelycoupled to a game console, and so forth.

FIG. 11 depicts a procedure 1100 in an example implementation in which adisplay device is viewed at different distances such that a field ofview is expanded the closer the distance between the user and thedevice. A display device of a computing device is viewed at a firstdistance such that a first field of view of a user interface displayedby the display device is viewable (block 1102). The computing device102, for instance, may be supported by a surface, e.g., mounted to awall like a television, rested on a desk to tabletop such as a computermonitor. In another example, the computing device 102 may assume ahandheld configuration and be held at approximately arm's length. Anexample of this is illustrated in the first stage 602 of FIGS. 6 and 7.

The display device of the computing device is viewed at a seconddistance that is less than the first distance such that a second fieldof view of the user interface displayed by the display device isviewable that is greater than the first field of view (block 1104). Auser, for instance, may bring the computing device 102 that is beingheld closer to the user's eyes. In another instance, a user may movetoward the computing device 102 to lessen the distance. Because the userinterface is displayed at an image plane focused at infinity, the fieldof view may increase as shown in the second stage 604 of FIGS. 6 and 8.

Example System and Device

FIG. 12 illustrates an example system generally at 1200 that includes anexample computing device 1202 that is representative of one or morecomputing systems and/or devices that may implement the varioustechniques described herein. The computing device 1202 may be, forexample, a server of a service provider, a device associated with aclient (e.g., a client device), an on-chip system, and/or any othersuitable computing device or computing system. Further, the computingdevice 1202 includes a display device 110 as previously described, whichmay incorporate a light guide 202 and light engine 204 as furtherdetailed in relation to FIG. 2.

The example computing device 1202 as illustrated includes a processingsystem 1204, one or more computer-readable media 1206, and one or moreI/O interface 1208 that are communicatively coupled, one to another.Although not shown, the computing device 1202 may further include asystem bus or other data and command transfer system that couples thevarious components, one to another. A system bus can include any one orcombination of different bus structures, such as a memory bus or memorycontroller, a peripheral bus, a universal serial bus, and/or a processoror local bus that utilizes any of a variety of bus architectures. Avariety of other examples are also contemplated, such as control anddata lines.

The processing system 1204 is representative of functionality to performone or more operations using hardware. Accordingly, the processingsystem 1204 is illustrated as including hardware element 1210 that maybe configured as processors, functional blocks, and so forth. This mayinclude implementation in hardware as an application specific integratedcircuit or other logic device formed using one or more semiconductors.The hardware elements 1210 are not limited by the materials from whichthey are formed or the processing mechanisms employed therein. Forexample, processors may be comprised of semiconductor(s) and/ortransistors (e.g., electronic integrated circuits (ICs)). In such acontext, processor-executable instructions may beelectronically-executable instructions.

The computer-readable storage media 1206 is illustrated as includingmemory/storage 1212. The memory/storage 1212 represents memory/storagecapacity associated with one or more computer-readable media. Thememory/storage component 1212 may include volatile media (such as randomaccess memory (RAM)) and/or nonvolatile media (such as read only memory(ROM), Flash memory, optical disks, magnetic disks, and so forth). Thememory/storage component 1212 may include fixed media (e.g., RAM, ROM, afixed hard drive, and so on) as well as removable media (e.g., Flashmemory, a removable hard drive, an optical disc, and so forth). Thecomputer-readable media 1206 may be configured in a variety of otherways as further described below.

Input/output interface(s) 1208 are representative of functionality toallow a user to enter commands and information to computing device 1202,and also allow information to be presented to the user and/or othercomponents or devices using various input/output devices. Examples ofinput devices include a keyboard, a cursor control device (e.g., amouse), a microphone, a scanner, touch functionality (e.g., capacitiveor other sensors that are configured to detect physical touch), a camera(e.g., which may employ visible or non-visible wavelengths such asinfrared frequencies to recognize movement as gestures that do notinvolve touch), and so forth. Examples of output devices include adisplay device (e.g., a monitor or projector), speakers, a printer, anetwork card, tactile-response device, and so forth. Thus, the computingdevice 1202 may be configured in a variety of ways as further describedbelow to support user interaction.

Various techniques may be described herein in the general context ofsoftware, hardware elements, or program modules. Generally, such modulesinclude routines, programs, objects, elements, components, datastructures, and so forth that perform particular tasks or implementparticular abstract data types. The terms “module,” “functionality,” and“component” as used herein generally represent software, firmware,hardware, or a combination thereof. The features of the techniquesdescribed herein are platform-independent, meaning that the techniquesmay be implemented on a variety of commercial computing platforms havinga variety of processors.

An implementation of the described modules and techniques may be storedon or transmitted across some form of computer-readable media. Thecomputer-readable media may include a variety of media that may beaccessed by the computing device 1202. By way of example, and notlimitation, computer-readable media may include “computer-readablestorage media” and “computer-readable signal media.”

“Computer-readable storage media” may refer to media and/or devices thatenable persistent and/or non-transitory storage of information incontrast to mere signal transmission, carrier waves, or signals per se.Thus, computer-readable storage media refers to non-signal bearingmedia. The computer-readable storage media includes hardware such asvolatile and non-volatile, removable and non-removable media and/orstorage devices implemented in a method or technology suitable forstorage of information such as computer readable instructions, datastructures, program modules, logic elements/circuits, or other data.Examples of computer-readable storage media may include, but are notlimited to, RAM, ROM, EEPROM, flash memory or other memory technology,CD-ROM, digital versatile disks (DVD) or other optical storage, harddisks, magnetic cassettes, magnetic tape, magnetic disk storage or othermagnetic storage devices, or other storage device, tangible media, orarticle of manufacture suitable to store the desired information andwhich may be accessed by a computer.

“Computer-readable signal media” may refer to a signal-bearing mediumthat is configured to transmit instructions to the hardware of thecomputing device 1202, such as via a network. Signal media typically mayembody computer readable instructions, data structures, program modules,or other data in a modulated data signal, such as carrier waves, datasignals, or other transport mechanism. Signal media also include anyinformation delivery media. The term “modulated data signal” means asignal that has one or more of its characteristics set or changed insuch a manner as to encode information in the signal. By way of example,and not limitation, communication media include wired media such as awired network or direct-wired connection, and wireless media such asacoustic, RF, infrared, and other wireless media.

As previously described, hardware elements 1210 and computer-readablemedia 1206 are representative of modules, programmable device logicand/or fixed device logic implemented in a hardware form that may beemployed in some embodiments to implement at least some aspects of thetechniques described herein, such as to perform one or moreinstructions. Hardware may include components of an integrated circuitor on-chip system, an application-specific integrated circuit (ASIC), afield-programmable gate array (FPGA), a complex programmable logicdevice (CPLD), and other implementations in silicon or other hardware.In this context, hardware may operate as a processing device thatperforms program tasks defined by instructions and/or logic embodied bythe hardware as well as a hardware utilized to store instructions forexecution, e.g., the computer-readable storage media describedpreviously.

Combinations of the foregoing may also be employed to implement varioustechniques described herein. Accordingly, software, hardware, orexecutable modules may be implemented as one or more instructions and/orlogic embodied on some form of computer-readable storage media and/or byone or more hardware elements 1210. The computing device 1202 may beconfigured to implement particular instructions and/or functionscorresponding to the software and/or hardware modules. Accordingly,implementation of a module that is executable by the computing device1202 as software may be achieved at least partially in hardware, e.g.,through use of computer-readable storage media and/or hardware elements1210 of the processing system 1204. The instructions and/or functionsmay be executable/operable by one or more articles of manufacture (forexample, one or more computing devices 1202 and/or processing systems1204) to implement techniques, modules, and examples described herein.

As further illustrated in FIG. 12, the example system 1200 enablesubiquitous environments for a seamless user experience when runningapplications on a personal computer (PC), a television device, and/or amobile device. Services and applications run substantially similar inall three environments for a common user experience when transitioningfrom one device to the next while utilizing an application, playing avideo game, watching a video, and so on.

In the example system 1200, multiple devices are interconnected througha central computing device. The central computing device may be local tothe multiple devices or may be located remotely from the multipledevices. In one embodiment, the central computing device may be a cloudof one or more server computers that are connected to the multipledevices through a network, the Internet, or other data communicationlink.

In one embodiment, this interconnection architecture enablesfunctionality to be delivered across multiple devices to provide acommon and seamless experience to a user of the multiple devices. Eachof the multiple devices may have different physical requirements andcapabilities, and the central computing device uses a platform to enablethe delivery of an experience to the device that is both tailored to thedevice and yet common to all devices. In one embodiment, a class oftarget devices is created and experiences are tailored to the genericclass of devices. A class of devices may be defined by physicalfeatures, types of usage, or other common characteristics of thedevices.

In various implementations, the computing device 1202 may assume avariety of different configurations, such as for computer 1214, mobile1216, and television 1218 uses. Each of these configurations includesdevices that may have generally different constructs and capabilities,and thus the computing device 1202 may be configured according to one ormore of the different device classes and accordingly the display device110 may also be configured to accommodate these differentconfigurations. For instance, the computing device 1202 may beimplemented as the computer 1214 class of a device that includes apersonal computer, desktop computer, a multi-screen computer, laptopcomputer, netbook, and so on.

The computing device 1202 may also be implemented as the mobile 1216class of device that includes mobile devices, such as a mobile phone,portable music player, portable gaming device, a tablet computer, amulti-screen computer, and so on. The computing device 1202 may also beimplemented as the television 1218 class of device that includes deviceshaving or connected to generally larger screens in casual viewingenvironments. These devices include televisions, set-top boxes, gamingconsoles, and so on.

The techniques described herein may be supported by these variousconfigurations of the computing device 1202 and are not limited to thespecific examples of the techniques described herein. This functionalitymay also be implemented all or in part through use of a distributedsystem, such as over a “cloud” 1220 via a platform 1222 as describedbelow.

The cloud 1220 includes and/or is representative of a platform 1222 forresources 1224. The platform 1222 abstracts underlying functionality ofhardware (e.g., servers) and software resources of the cloud 1220. Theresources 1224 may include applications and/or data that can be utilizedwhile computer processing is executed on servers that are remote fromthe computing device 1202. Resources 1224 can also include servicesprovided over the Internet and/or through a subscriber network, such asa cellular or Wi-Fi network.

The platform 1222 may abstract resources and functions to connect thecomputing device 1202 with other computing devices. The platform 1222may also serve to abstract scaling of resources to provide acorresponding level of scale to encountered demand for the resources1224 that are implemented via the platform 1222. Accordingly, in aninterconnected device embodiment, implementation of functionalitydescribed herein may be distributed throughout the system 1200. Forexample, the functionality may be implemented in part on the computingdevice 1202 as well as via the platform 1222 that abstracts thefunctionality of the cloud 1220.

CONCLUSION

Although the invention has been described in language specific tostructural features and/or methodological acts, it is to be understoodthat the invention defined in the appended claims is not necessarilylimited to the specific features or acts described. Rather, the specificfeatures and acts are disclosed as example forms of implementing theclaimed invention.

What is claimed is:
 1. An apparatus comprising: a housing configured ina hand-held form factor; a light guide supported by the housing; a lightengine disposed within the housing and optically coupled to the lightguide; and one or more modules disposed within the housing andimplemented at least partially in hardware, the one or more modulesconfigured to cause the light engine to output a user interface fordisplay using the light guide along an image plane focused at infinity.2. An apparatus as described in claim 1, wherein the light guide isconfigured to be at least partially transparent such that at least partof a physical surroundings of the apparatus is viewable through thelight guide.
 3. An apparatus as described in claim 2, wherein the atleast part of the physical surroundings and at least part of the userinterface are viewable concurrently using the light guide.
 4. Anapparatus as described in claim 1, wherein the light guide includesfront and rear surfaces that oppose each other, each having touchsensors that are configured for use in detecting inputs to interact withthe apparatus.
 5. An apparatus as described in claim 1, wherein thelight guide is configured to display the user interface at leastpartially in three dimensions.
 6. An apparatus as described in claim 1,wherein the one or more modules are further configured to executeapplications and provide telephone functionality.
 7. An apparatus asdescribed in claim 6, wherein the housing is configured as a tablet ormobile phone.
 8. An apparatus as described in claim 1, wherein the userinterface is viewable by a user when the light guide is positionedapproximately one inch from an eye of the user and when positioned atapproximately at an arm's length from the user.
 9. An apparatuscomprising: a housing configured in a hand-held form factor; a lightguide, supported by the housing, having a first side configured to beviewed by a user and a second side opposing the first side that includesone or more touch sensors; a light engine disposed within the housingand optically coupled to the light guide; and one or more modulesdisposed within the housing and implemented at least partially inhardware, the one or more modules configured to cause the light engineto project a user interface for display using the light guide that isviewable via the first side and detect one or more inputs using the oneor more touch sensors located via the second side, the one or moreinputs usable to initiate one or more operations.
 10. An apparatus asdescribed in claim 9, wherein the one or more modules are configured torecognize one or more gestures from the one or more inputs detected fromthe one or more touch sensors.
 11. An apparatus as described in claim 9,wherein the light guide further comprises at least one touch sensorincluded on the first side.
 12. An apparatus as described in claim 9,wherein the light guide is configured to be at least partiallytransparent such that at least part of a physical surroundings of theapparatus is viewable through the light guide.
 13. An apparatus asdescribed in claim 12, wherein the at least part of the physicalsurroundings and at least part of the user interface are viewableconcurrently using the light guide.
 14. An apparatus as described inclaim 9, wherein the one or more modules are further configured toexecute applications and provide telephone functionality.
 15. Anapparatus as described in claim 14, wherein the housing is configured asa tablet or mobile phone.
 16. An apparatus as described in claim 9,wherein the one or more modules are configured to cause the light engineto output the user interface for display using the light guide along animage plane focused at infinity.
 17. An apparatus comprising: a housing;a light guide supported by the housing having a first side that isviewable by a user, a second side opposing the first side, andswitchable in-coupling optics; a light engine disposed within thehousing and optically coupled to the in-coupling optics of the lightguide; and one or more modules disposed within the housing andimplemented at least partially in hardware, the one or more modulescommunicatively coupled to the switchable in-coupling optics to cause aswitch between a first mode in which an output of the light engine isdisplayed through the first side of the light guide and a second mode inwhich an output of the light engine passes through the second side ofthe light guide.
 18. An apparatus as described in claim 17, wherein thesecond side of the light guide is disposed proximal to at least one lensto transmit an output of the light engine in the second mode out a backof the housing that is positioned as opposing the first side of thelight guide.
 19. An apparatus as described in claim 17, wherein theswitchable in-coupling optics are implemented at least partially using aswitchable Bragg grating.
 20. An apparatus as described in claim 17,wherein the light guide is configured to be at least partiallytransparent such that at least part of a physical surroundings of theapparatus is viewable through the light guide.